my buddy runs 220s and it runs great
maybe a tad lean
he has full bills pipes and a set of prolite pistons
try 2 220s
but stock should be like 200s or 205 i dont know where ur 180s came from
wow you have no idea in the world what your talking about. he just had his bike bored .40 over, got an aggressive port job, and added FMF torque reeds. now if his bike was setup similar to your friends bike before he added all of these things then why would you not rejet it to acomadate for the extra flow?
First of all, stock banshee main jets are (200's, 210's, or 220's) depending on your altitude and climate. Second, you dont have to rejet for pistons, and there is no such thing as "full" two stroke pipes it would be pointless to buy just silencers the power is in the expantion chambers.
albayfz350- you have aftermarket keihin carbrators, you need to find out what mm of carbs they are and i would go on bansheehq.com and ask the to help you setup those carbs. I have little to no experience with keihin's although they are a very good carb.
Jetting tips: start with your main jet and keep stuffing bigger ones in there until your bike fills like it "chokes out" at high speeds, then install 1 size lower on the mains. then you can work with the needle and the pilot.